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Match the laws given in Column I with expressions given in Column II
Column I Column II
i) Lead storage
battery p) During discharging density
of $H_{2} S O_{4}$ decreases
ii) Mercury cell q) Reaction at cathode $4 \bar{e} + O_{2} + 2 H_{2} O \to 4 O H^{-}$
iii) Fuel cell r) Reaction at cathode $M n O_{2} + N H_{4}^{+} + e^{-} \to M n O (O H) + N H_{3}$
iv) Leclanche cell s) Sutable for low current devices like hearing aids

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i-p, ii-r, iii- q, iv- s

i-p, ii-s, iii- q, iv- r

i-q, ii-r, iii- p, iv- s

i-s, ii-p, iii- q, iv- r

answer is D.

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